Replacing the egr gasket on my car and just wondered if anyone ever cleaned their exhaust system. I was thinking a water flush after the engine so that everything gets flushed out through the rear exhaust, this would also rinse the catalytic converter. Then I would crank over the engine and give a couple strong revs and then maintain a steady rpm to dry/blow everything out. Or is this a really stupid idea?

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1990 190E 3.0L